Hi Jake

The CASM data is stored in the style file.

You can not create more different patterns for certain chord types at the keyboard.
This can only be done in CASM software; e.g. my "Creative Style Maker" at http://www.jososoft.dk/yamaha/software/csm/index.htm

Register for the Lite version (free) and you will be able to edit all CASM data.

Regards
Jørgen

BTW: There is more information about CASM in the help file to this program.